From 21 to 22 Peter missed all of spring coming off of elbow surgery from an injury suffered in the bowl game and he missed the majority of fall camp from a severely pulled groin muscle that took a long time to heal. Thats a lot of valuable reps with 2 new QBs that were coming in competing for the job, that he missed out on. But BP is correct. He steadily progressed throughout his career in yards until last year. Just look up the stats.